Vaporizing device for liquefied gases



March 27, 1934. o. A. HANSEN VAPORIZING' DEVICE FOR LIQUEFIED GASESFiled March 1, 1933 INVENTOR 'ing device of the convection type forliquid 0 obvious and will in part appear herei Patented Mar 27, 1934 tre nesaccc VrlPilRli'ZdNG iron cases,

Odd Arnold sen, Buffalo, It, "21 to The Linde Products Company, New itN. "ill, a oi? @hio Application March 31, 119353, No 659,191

izing liquid oxygen discharged from a container,

in a manner which reduces operating hazards while the temperature of theoxygen heating parts is substantially at the temperature of theatmosphere, thereby reducing heat leakage to the atmosphere.

It is a further object toprovide a device for heating liquid oxygen byconvection in which. the heat supplying means is relatively distant fromthe oxygen heating coil and is arranged to eh ect circulation of theheat conveying medium in counter-current fashion over the oxygen heatingcoil, whereby a relatively uniform temperature difference is maintainedalong such coil.

It is a still further object to provide a va oriz heating systems whichemploys air as the conveying medium and is constructed to 7 againstundue variation in the thermal ch teristics of the medium, such as thespecific capacity and thermal conductivity of the me @ther objects ofthe invention will i i The invention accordingly comprises tures ofconstruction, combination of and arrangement of parts, which will e ilied in the construction hereinafter set the scope of the application ofwhich cated in the claims.

For a fuller understanding of the nature objects of the invention,reference should nacl to the following detailed description taken incon= nection with the accompanying drawing in which: I

Fig. l is a view mainly in elevation showing a container for liquidoxygen having connected thereto a vaporizing device constructed inaccordance with the invention;

Fig. 2 is an enlarged vertical section of the vaporizing device taken onthe line 2-2 of Fig. l and Fig. 3 is a fragmentary view mainly inelevation, parts being broken away showing further lhel details n theconstruction of the vaporizing de= vice shown in Referring now to thedrawing and particularly to Fig. 1, 1c denotes generally a container forliquefied gas, that shown being of the insulated type, such as isemployed for supplying liquid oxygen for industrial consumption. Thecon= tainer stands on a suitable foundation and is provided with aliquid discharge conduit 11 leading from a control panel 12 on thecontainer to a vaporizing device, shown generally at a.

The vaporizing device here employed is adapt ed to supply a relativelylarge quantity oi heat to the liquid withdrawn from the container, sinceit is desired not only to cause the liquefied gas to change from theliquid phase into the vapor phase so that the temperature of its vaporphase will be increased a substantial amount above the boiling point ofthe liquefied gas, but also in a manner that substantially insuresagainst over-e heating the parts. To this end, the vaporizing devicecomprises a substantially closed chamber in which a heat supplying meansis located at a distance from a heat absorbing means through which theliquid oxygen passes, the heat being transferred by convection from thesupply means to the absorbing r ans through a suitable heat conveyinginedi' such as air. in order that this air may not i" ve its thermalcharacteristics adversely affects Icy intermittent operation of wouldcause expansions and the vaporizing device is -ea hing device 18, whichaf- "catien between the circulating e cuter atmosphere and extractsentering air, whereby sub e circulates in the" chain evice may be oi anysuite, that shown in the co- L. Dana and ll.

Z'Zenner, ,269, where a. depending champs open t e lower end, contains al'llOiS- ture extracting a it, such as calcium chloride, andcommunicates at the upper end with the chamber to be supplied with dryair; communication here being provided by way of the con nection shownat it.

The oxygen thus heated passes from the vapor izing device a manner suchthat it will not unduly cool operating parts subsequently traversed, forexample, aregulating device, shown conventionally at i l, interposed inthe consumers pipe line 15. While it is customary to in terposeregulating devices which maintain a desired delivery pressure in theconsumers pipe line, as here shown, it is desired that this regulating,device shall be at no time so low a temperature as to impede the properfunctioning or the parts. The use of such devices, however, comprises nopart of the present invention, but is shown here merely as exemplary ofan oper= ating device which is protected against undesired temperatures.

The construction of a preferred form of vaporing device, depictedsomewhat symbolically in g. l, is shown more in detail Figs. 2 and 3.Z-lere, a casing is employed. which is preferably c" e double walledvariety and has heat insula on nterposed. Witl dn this casing is disposed .nsverse barrier it, which does not duite e tend to the bottom oithe casing and stops sho t of the thereof. in this manner, a circulationpassage is provided about the bar rier in the heat conveyi" inediurnch-culates in ascending and descending currents.

The means for supplying heat may be of any convenient torn: andcharacter, but is preferably electric heating means 18, which is hereshown as corn rising a plurality of superposed banks of electric heatingelements in which the heating elements are directly exposed to the Eachof these banks as seen from 8 comprises a pair or rod-like horizontalinsulating supports 20 and so which support a plurality of turns 19 of aresistance. These turns or elements may be connected elect 'cally in anysuitable manner adapted to supply SllflCiGll'b electric current toaccomplish the desired heating effect. The means for supplying theheating current to the heating elements oi the vaporizer a is showngenorally at 21 in Fig. l and include an electric con trol panel 22.

Heat absorbing rneans, traversed by the gas material to be disposed inthe casing. {Elie heat absorbing means here shown comprises plurality ofcoils 23 connected to be traversed by the gas material successivelywhich are provided with heat conducting fins 24 that divide thecirculating medium into small streams and quickly conduct the abstractedheat to the material within the coils 23. The inlet oi the coils'isconnectedto the conduit 11 at a point in a relatively cold portion ofthe descending current of circulating medium, while the dischargeconduit 15 is connected' to the coils at a point which is in arelatively warm portion of the descending current of circulating medium.By this arrangement, it is seen that the coils employ thecounter-current method or" heating the gas material traversing the sameand insure a relatively uniform difference along the coils between thetemperature within the coils and that of the adjacent medium on theexterior of the same. The coils 23, while they may be in general locatedanywhere in the path of the circulating medium, are preferably disposedin a region which is at some dis-= tance from the heat radiating means18. Accordingly, the coils 23 and means 18 are shown on the oppositeside of the barrier 17, the means 18 being disposed at the beginning ofan ascending current of circulating medium whilecoils 23 are at thebeginning of a descending current.

In operation, withdrawn from the container 10 through the conduit 11 andpassed to the heat absorbing coils in the vaporizer c. Here, the coilsare subject to the heating influence of the circulating medium andabstract quickly the heat therefrom as pointed out above. It is seenthat by reason resistance type of electric heater, it is conteinll eatedand vaporized, are also it is seen that gas material is of the verticalarrangement of the heat radiating means and heat absorbing means and bytheir disposition on opposite sides of the barrier 17, a rapidcirculation of this medium is effected,

since it is quickly cooled by the heat absorbing 89 coils and passed tothe lower end ofthe casing a, where it is again heated by the heatradiating means 18 and caused to rise under the influence of the fieldof gravity. The casing a being substantially closed, permits no ingressof atinosperature for the heat tran age from the system. is red arelatively small amount.

While the heating means here described is a plated that other types oielect'ic heaters also be employed, for example, induction hea s Whereinduction heaters are employed, the ducing winding may, with advail ge,be so'placed as to induce the heating current directly in the coils ofthe heat absorbin means.

Since certain changes maybe made in above construction and differentembodiments of the invention could be made without departing from thescope thereof, it is intended that all matter 1 contained the abovedescri tion or shown the accompanying drawing shall be interpreted asillustrative and not in a limiting sense.

Having described my invention, what I. c m as new and desire to secureLetters 1: ent, is:

l. in a vaporizing device for liquefied gas, the combination comprisinga substantially closed casing havingan unimpeded circuitous passagetherein about which a gaseous heat conveying medium is circulated byconvection, a heat ab sorbing means adapted to be traversed by the gasmaterial to be elevated in temperature disposed. in one portion of saidpassage, means for heating said medium disposed in said passage in aposition relative to said heat absorbing means such as to induceconvection under the influence of gravity.

2. In a vaporizing device for liquefied gases,- the combinationcomprising a substantially closed casing, having an independent barrierstopping short of its upper and lower ends about which barrier air isadapted to circulate freely, heat absorbing means including a coiltraversed by the gas material to be elevated in temperature disposed onone side of said barrier, and heat radiating means disposed in saidcasing on the other side of said barrier and at such a distancefrom saidheat absorbing means as to induce circulation of said air under theinfluence of gravity.

3. In a vaporizing device for liquid oxygen, the combination comprisinga substantially closed insulating casing having a barrier disposed in asubstantially vertical plane extending across said casing but stoppingshort thereof at its upper and lower ends about which barrier air isadapted to circulate, heat absorbing means including a coil traversed bythe oxygen to be elevated in temperature disposed in said casing on oneside of said barrier adjacent the upper end, and heat radiat- 150 ingmeans disposed in said casing on the other side of said barrier adjacentthe lower end.

4. In a vaporizing device for liquid oxygen, the combination comprisinga substantially closed insulating casing having a barrier stopping shortI of its upper and lower ends and positioned to form a passage ofrelatively uniform cross-sectional area through which air is adapted tocir= culate, heat absorbing means including a plurality of coilsarranged to be traversed successively by the oxygen to be elevated intemperature disposed in said casing with the inlet in a relatively coldportion of the circulation passage and the outlet in a relatively warmportion of said circulating passage, and electric heating elementsdisposed in said casing on the other side of said barrier substantiallybelow said heating coils.

v 5. In a vaporizing device for liquid oxygen, the combinationcomprising a substantially closed in-= sulating casing, a barrierdisposed in a substantially vertical plane extending across said casingbut stopping short thereof at its upper and lower ends, means foradmitting dehydrated air from the atmosphere to said casing forcirculation as a heat conveying medium about said barrier, a heatabsorbing means including a plurality of tubular coils arranged to betraversed by the oxygen to be elevated in temperature flowing insuccession therethrough and disposed in said casing on one side of saidbarrier adjacent its upper end, an inlet connection for said coilsleading to the substantially lowest point thereof, an outlet connectionfor said coils leading from the substantially highest point thereof, andelectric heating means disposed in said casing on the other side of saidbarrier adjacent the lower end thereof.

ODD ARNOLD HANSEN.

